YLJ 69336 AccuProbe UV Leak Detector with CaseUse the electrolyte sensor or UV technology (or both at the same time) to detect HFC, HCFC and CFC refrigerants, including SNAP applroved hydrocarbon blends. The Smart Alarm LED shows how big or small a leak is on a scale of one to nime. With the electrolyte sensor, UV lights and Smart Alarm indicator, this is the only tool you need for fast, easy and certain leak detection. The ultra sensitive sensor of the YELLOW JACKET AccuProbe UV Handheld Leak